Question

If a wire is jointly as b and the cube of side n is equals to 200 when b is equals to 5 and b is equals to 2 find a and b is equals to 6 and c is equals to 3

Answer 1

Answer:

Step-by-step explanation:

y = 120

Discussion:

"y varies jointly as x and  z"  ==>    y = k*x*z   where k is a constant

Substitute y = 70, x = 7, z = 2 in this equation to determine the value of k

y     = k *x * z

70   = k * 7 * 2   or

70 = 14k or

k = 5.

So  y = 5 *x * z is the equation of variation.

Substituting x = 6 and z =4 in the equation gives

y = 5 * x * z = 5 * 6 * 4 = 120